Event:

Abstract:
Stroboscopic stimulation near the individual alpha frequency (IAF) induces visual hallucinations, yet the relationship between subjective experience and neural dynamics remains unclear. This study examines whether directional information transfer reflects top-down contributions to hallucinatory perception.
Healthy participants undergo EEG recording during rhythmic visual stimulation at 3 Hz, 18 Hz, IAF, and IAF ±1, ±2, and ±5 Hz. Hallucination intensity and quality are assessed after each stimulation block. Data collection is ongoing (n = 30 planned).
Hallucination intensity increased toward alpha-proximal frequencies and remained elevated at 18 Hz. Occipital EEG responses peaked at the IAF. Spectrally resolved analyses revealed significant occipito-frontal information transfer at alpha frequencies. Top-down (fronto-occipital) transfer at frequencies, peaking in the theta and alpha ranges occurred when visual hallucinations were present. This suggests that subjective hallucinatory experiences may be linked to this top-down information transfer.


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